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Summary: Nested Classes | Methods | Protected Methods | Inherited Methods

# JetPlayer

`public class JetPlayer`
`extends Object` ``

java.lang.Object
↳ | android.media.JetPlayer

JetPlayer provides access to JET content playback and control.

Please refer to the JET Creator User Manual for a presentation of the JET interactive music concept and how to use the JetCreator tool to create content to be player by JetPlayer.

Use of the JetPlayer class is based around the playback of a number of JET segments sequentially added to a playback FIFO queue. The rendering of the MIDI content stored in each segment can be dynamically affected by two mechanisms:

- tracks in a segment can be muted or unmuted at any moment, individually or through a mask (to change the mute state of multiple tracks at once)
- parts of tracks in a segment can be played at predefined points in the segment, in order to maintain synchronization with the other tracks in the segment. This is achieved through the notion of "clips", which can be triggered at any time, but that will play only at the right time, as authored in the corresponding JET file.

As a result of the rendering and playback of the JET segments, the user of the JetPlayer instance can receive notifications from the JET engine relative to:

- the playback state,
- the number of segments left to play in the queue,
- application controller events (CC80-83) to mark points in the MIDI segments.

Use `getJetPlayer()` to construct a JetPlayer instance. JetPlayer is a singleton class.

### Developer Guides

For more information about how to use JetPlayer, read the JetPlayer developer guide.

## Summary

### Nested classes
`interface` | `JetPlayer.OnJetEventListener` Handles the notification when the JET engine generates an event.

### Public methods
`boolean` | `clearQueue()` Empties the segment queue, and clears all clips that are scheduled for playback.
`Object` | `clone()` Cloning a JetPlayer instance is not supported.
`boolean` | `closeJetFile()` Closes the resource containing the JET content.
`static JetPlayer` | `getJetPlayer()` Factory method for the JetPlayer class.
`static int` | `getMaxTracks()` Returns the maximum number of simultaneous MIDI tracks supported by JetPlayer
`boolean` | `loadJetFile(String path)` Loads a .jet file from a given path.
`boolean` | `loadJetFile(AssetFileDescriptor afd)` Loads a .jet file from an asset file descriptor.
`boolean` | `pause()` Pauses the playback of the JET segment queue.
`boolean` | `play()` Starts playing the JET segment queue.
`boolean` | `queueJetSegment(int segmentNum, int libNum, int repeatCount, int transpose, int muteFlags, byte userID)` Queues the specified segment in the JET queue.
`boolean` | `queueJetSegmentMuteArray(int segmentNum, int libNum, int repeatCount, int transpose, boolean[] muteArray, byte userID)` Queues the specified segment in the JET queue.
`void` | `release()` Stops the current JET playback, and releases all associated native resources.
`void` | `setEventListener(JetPlayer.OnJetEventListener listener)` Sets the listener JetPlayer notifies when a JET event is generated by the rendering and playback engine.
`void` | `setEventListener(JetPlayer.OnJetEventListener listener, Handler handler)` Sets the listener JetPlayer notifies when a JET event is generated by the rendering and playback engine.
`boolean` | `setMuteArray(boolean[] muteArray, boolean sync)` Modifies the mute flags for the current active segment.
`boolean` | `setMuteFlag(int trackId, boolean muteFlag, boolean sync)` Mutes or unmutes a single track.
`boolean` | `setMuteFlags(int muteFlags, boolean sync)` Modifies the mute flags.
`boolean` | `triggerClip(int clipId)` Schedules the playback of a clip.

### Protected methods
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## Public methods

### clearQueue

    public boolean clearQueue ()

Empties the segment queue, and clears all clips that are scheduled for playback.

Returns
`boolean` | true if the queue was successfully cleared, false otherwise.

### clone

    public Object clone ()

Cloning a JetPlayer instance is not supported. Calling clone() will generate an exception.

Returns
`Object` | a clone of this instance.

Throws
`CloneNotSupportedException` |

### closeJetFile

    public boolean closeJetFile ()

Closes the resource containing the JET content.

Returns
`boolean` | true if successfully closed, false otherwise.

### getJetPlayer

    public static JetPlayer getJetPlayer ()

Factory method for the JetPlayer class.

Returns
`JetPlayer` | the singleton JetPlayer instance

### getMaxTracks

    public static int getMaxTracks ()

Returns the maximum number of simultaneous MIDI tracks supported by JetPlayer

Returns
`int` |

### loadJetFile

    public boolean loadJetFile (String path)

Loads a .jet file from a given path.

Parameters
`path` | `String`: the path to the .jet file, for instance "/sdcard/mygame/music.jet".

Returns
`boolean` | true if loading the .jet file was successful, false if loading failed.

### loadJetFile

    public boolean loadJetFile (AssetFileDescriptor afd)

Loads a .jet file from an asset file descriptor.

Parameters
`afd` | `AssetFileDescriptor`: the asset file descriptor.

Returns
`boolean` | true if loading the .jet file was successful, false if loading failed.

### pause

    public boolean pause ()

Pauses the playback of the JET segment queue.

Returns
`boolean` | true if rendering and playback is successfully paused, false otherwise.

### play

    public boolean play ()

Starts playing the JET segment queue.

Returns
`boolean` | true if rendering and playback is successfully started, false otherwise.

### queueJetSegment

    public boolean queueJetSegment (int segmentNum,
                    int libNum,
                    int repeatCount,
                    int transpose,
                    int muteFlags,
                    byte userID)

Queues the specified segment in the JET queue.

Parameters
`segmentNum` | `int`: the identifier of the segment.
`libNum` | `int`: the index of the sound bank associated with the segment. Use -1 to indicate that no sound bank (DLS file) is associated with this segment, in which case JET will use the General MIDI library.
`repeatCount` | `int`: the number of times the segment will be repeated. 0 means the segment will only play once. -1 means the segment will repeat indefinitely.
`transpose` | `int`: the amount of pitch transposition. Set to 0 for normal playback. Range is -12 to +12.
`muteFlags` | `int`: a bitmask to specify which MIDI tracks will be muted during playback. Bit 0 affects track 0, bit 1 affects track 1 etc.
`userID` | `byte`: a value specified by the application that uniquely identifies the segment. this value is received in the `OnJetEventListener#onJetUserIdUpdate(JetPlayer, int, int)` event listener method. Normally, the application will keep a byte value that is incremented each time a new segment is queued up. This can be used to look up any special characteristics of that track including trigger clips and mute flags.

Returns
`boolean` | true if the segment was successfully queued, false if the queue is full or if the parameters are invalid.

### queueJetSegmentMuteArray

    public boolean queueJetSegmentMuteArray (int segmentNum,
                    int libNum,
                    int repeatCount,
                    int transpose,
                    boolean[] muteArray,
                    byte userID)

Queues the specified segment in the JET queue.

Parameters
`segmentNum` | `int`: the identifier of the segment.
`libNum` | `int`: the index of the soundbank associated with the segment. Use -1 to indicate that no sound bank (DLS file) is associated with this segment, in which case JET will use the General MIDI library.
`repeatCount` | `int`: the number of times the segment will be repeated. 0 means the segment will only play once. -1 means the segment will repeat indefinitely.
`transpose` | `int`: the amount of pitch transposition. Set to 0 for normal playback. Range is -12 to +12.
`muteArray` | `boolean`: an array of booleans to specify which MIDI tracks will be muted during playback. The value at index 0 affects track 0, value at index 1 affects track 1 etc. The length of the array must be `getMaxTracks()` for the call to succeed.
`userID` | `byte`: a value specified by the application that uniquely identifies the segment. this value is received in the `OnJetEventListener#onJetUserIdUpdate(JetPlayer, int, int)` event listener method. Normally, the application will keep a byte value that is incremented each time a new segment is queued up. This can be used to look up any special characteristics of that track including trigger clips and mute flags.

Returns
`boolean` | true if the segment was successfully queued, false if the queue is full or if the parameters are invalid.

### release

    public void release ()

Stops the current JET playback, and releases all associated native resources. The object can no longer be used and the reference should be set to null after a call to release().

### setEventListener

    public void setEventListener (JetPlayer.OnJetEventListener listener)

Sets the listener JetPlayer notifies when a JET event is generated by the rendering and playback engine. Notifications will be received in the same thread as the one in which the JetPlayer instance was created.

### setEventListener

    public void setEventListener (JetPlayer.OnJetEventListener listener,
                    Handler handler)

Sets the listener JetPlayer notifies when a JET event is generated by the rendering and playback engine. Use this method to receive JET events in the Handler associated with another thread than the one in which you created the JetPlayer instance.

Parameters
`handler` | `Handler`: the Handler that will receive the event notification messages.

### setMuteArray

    public boolean setMuteArray (boolean[] muteArray,
                    boolean sync)

Modifies the mute flags for the current active segment.

Parameters
`muteArray` | `boolean`: an array of booleans to specify which MIDI tracks are muted. The value at index 0 affects track 0, value at index 1 affects track 1 etc. The length of the array must be `getMaxTracks()` for the call to succeed.
`sync` | `boolean`: if false, the new mute flags will be applied as soon as possible by the JET render and playback engine. If true, the mute flags will be updated at the start of the next segment. If the segment is repeated, the flags will take effect the next time segment is repeated.

Returns
`boolean` | true if the mute flags were successfully updated, false otherwise.

### setMuteFlag

    public boolean setMuteFlag (int trackId,
                    boolean muteFlag,
                    boolean sync)

Mutes or unmutes a single track.

Parameters
`trackId` | `int`: the index of the track to mute.
`muteFlag` | `boolean`: set to true to mute, false to unmute.
`sync` | `boolean`: if false, the new mute flags will be applied as soon as possible by the JET render and playback engine. If true, the mute flag will be updated at the start of the next segment. If the segment is repeated, the flag will take effect the next time segment is repeated.

Returns
`boolean` | true if the mute flag was successfully updated, false otherwise.

### setMuteFlags

    public boolean setMuteFlags (int muteFlags,
                    boolean sync)

Modifies the mute flags.

Parameters
`muteFlags` | `int`: a bitmask to specify which MIDI tracks are muted. Bit 0 affects track 0, bit 1 affects track 1 etc.
`sync` | `boolean`: if false, the new mute flags will be applied as soon as possible by the JET render and playback engine. If true, the mute flags will be updated at the start of the next segment. If the segment is repeated, the flags will take effect the next time segment is repeated.

Returns
`boolean` | true if the mute flags were successfully updated, false otherwise.

### triggerClip

    public boolean triggerClip (int clipId)

Schedules the playback of a clip. This will automatically update the mute flags in sync with the JET Clip Marker (controller 103). The parameter clipID must be in the range of 0-63. After the call to triggerClip, when JET next encounters a controller event 103 with bits 0-5 of the value equal to clipID and bit 6 set to 1, it will automatically unmute the track containing the controller event. When JET encounters the complementary controller event 103 with bits 0-5 of the value equal to clipID and bit 6 set to 0, it will mute the track again.

Parameters
`clipId` | `int`: the identifier of the clip to trigger.

Returns
`boolean` | true if the clip was successfully triggered, false otherwise.

## Protected methods

### finalize

    protected void finalize ()

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. A subclass overrides the `finalize` method to dispose of system resources or to perform other cleanup.

The general contract of `finalize` is that it is invoked if and when the Java™ virtual machine has determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, except as a result of an action taken by the finalization of some other object or class which is ready to be finalized. The `finalize` method may take any action, including making this object available again to other threads; the usual purpose of `finalize`, however, is to perform cleanup actions before the object is irrevocably discarded. For example, the finalize method for an object that represents an input/output connection might perform explicit I/O transactions to break the connection before the object is permanently discarded.

The `finalize` method of class `Object` performs no special action; it simply returns normally. Subclasses of `Object` may override this definition.

The Java programming language does not guarantee which thread will invoke the `finalize` method for any given object. It is guaranteed, however, that the thread that invokes finalize will not be holding any user-visible synchronization locks when finalize is invoked. If an uncaught exception is thrown by the finalize method, the exception is ignored and finalization of that object terminates.

After the `finalize` method has been invoked for an object, no further action is taken until the Java virtual machine has again determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, including possible actions by other objects or classes which are ready to be finalized, at which point the object may be discarded.

The `finalize` method is never invoked more than once by a Java virtual machine for any given object.

Any exception thrown by the `finalize` method causes the finalization of this object to be halted, but is otherwise ignored.

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